endorsement

a promotional statement (as found on the dust jackets of books); "the author got all his friends to write blurbs for his book"

a speech seconding a motion; "do I hear a second?"

formal and explicit approval; "a Democrat usually gets the union's endorsement"

a signature that validates something; "the cashier would not cash the check without an endorsement"

the act of endorsing; "a star athlete can make a lot of money from endorsements"